<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>ASSERTION: Options collection broken</title>
</head>

<body>

<div>

<select>
  <option id="n29">B
    <optgroup label="middle" id="n20">
      <option>N</option>
    </optgroup>
  </option>
  <option>M</option>
</select>

</div>

</body>
</html>